Design and numerical simulation of modified tunable THz filter based on periodic graphene-PVC ribbons

Abstract

In this article, a tunable tera Hertz (THz) filter made of graphene layers and PVC substrate has been proposed. By using static magnetic field, a new way is suggested in this filter that is suitable for tunning resonance frequency. Due to existence of magnetic field and gyromagnetic materials like graphene, the proposed configuration shows both TE and TM polarization in the structure output. In addition to this, about 5 THz bandwidth for tunability is achieved, which is so high compared with other works. All results have been obtained by numerical simulations through MATLAB software based on transfer matrix method (TMM) and validated by COMSOL software. With nearly zero transmission, this perfect tunable THz filter can pave the way for various applications including THz spectrometry.

Tunable terahertz filter based on graphene photonic crystals with defective layers

“…Mechanically tunable metallic photonic crystal [39] 140 G Hz 5% Mechanically tunable metallic photonic crystal [40] 375 GHz 5% Thermally tunable SrTiO 3 defect in a 1D photonic crystal [41] 142 GHz 60% Electrically tunable liquid crystal sandwiched between two woodpile metallic photonic crystals [42] 1.5 THz 10% Thermally-tunable B-shaped subwavelength metallic hole array with InSb bar [43] 1.38 THz 90% Mechanically tunable terahertz metamaterial on a highly elastomeric substrate [44] 0.66 THz 8% Temperature-controlled VO 2 bridges introduced into a metamaterial [45] 475 GHz 27% Mechanically tunable dual-layered SRR array [46] 1.345 THz 45% Mechanically tunable metallic photonic crystal [47] 695 GHz 48% Magnetically tunable one-dimensional graphene-embedded photonic crystal [48] 8.7 THz 60% This work 7.5 THz 71% FWHM are almost unchanged. That's because the surface conductivity of graphene is almost zero at higher frequency, therefore, the influence will be minimal.…”